I have a fenix 5s. Since the update to 14.10 the treadmill (and likely step) calibration is incorrect. I am able to consistently run 1.89 miles on the treadmill and the garmin records only 1 mile. My normal 6.1 mile run each morning is tracked at about 3.6 miles instead. I suspect this was broken with the last release as when looking at the changelog for the release treadmill calibration code was touched:
https://www8.garmin.com/support/download_details.jsp?id=11435
Changes made from version 13.40 to 14.10:
- Improved Pairing Experience with Garmin Dual ANT+/BLE Sensors.
- Made several code improvements and bug fixes for golf, especially CT10.
- Fixed an intermittent issue where the device could report an incorrect treadmill calibration.
- Fixed an issue where the hourly alert was off by minutes when manually changing time on device.
- Fixed an issue where stroke data during a rowing activity was not available on Varia vision.
Several others are having this problem with 14.10:
I have a support case opened with garmin (Reference ID: 14805131K1) but it's getting very little traction.